College Physics Explore and Apply

Eugenia Etkina; Alan Van Heuvelen; Gorazd Planinši?

ISBN #9780134601823

2nd Edition

2,244 Questions

46,660 Students Helped

Homework Questions

Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section emphasizes the fundamentals of static fluid mechanics, starting from the calculation of density and extending to the analysis of pressure variations via Pascal’s laws. It covers how fluids transmit pressure uniformly in enclosed systems, explains the buoyant force and Archimedes’ principle, and illustrates practical applications such as hydraulic lifts, diving bells, and ship stability. Mastery of these concepts is essential for solving a variety of real-world problems in both engineering and natural phenomena.

Learning Objectives

Key Concepts

CONCEPT

DEFINITION

Atomic Physics

The study of atomic models and structure, detailing the evolution from classical orbit models (e.g., Bohr’s model) to quantum mechanics with quantized energy levels, quantum numbers, the uncertainty principle, and tunneling.

Example Problems

Example 1

Determine the average density of Earth. What data did you use? What assumptions did you make?

Example 2

Use data for the normal pressure and the density of air near Earth's surface to estimate the height of the atmosphere, assuming it has uniform density. Indicate any additional assumptions you made. Are you on the low or high side of the real number?

Example 3

A single-level home has a floor area of $200 \mathrm{m}^{2}$ with ceilings that are $2.6 \mathrm{m}$ high. Estimate the mass of the air in the house.

Example 4

A diet decreases a person's mass by $5 \% .$ Exercise creates muscle and reduces fat, thus increasing the person's density by $2 \%$. Determine the percent change in the person's volume.

Example 5

A pulsar, an extremely dense rotating star made of neutrons, has a density of $10^{18} \mathrm{~kg} / \mathrm{~m}^{3}$. Determine the mass of a pulsar contained in a volume the size of your fist (about $200 \mathrm{~cm}^{3}$ ).